Researchers Achieve Breakthrough in Quantum Dot Laser Technology

New type of quantum dot enables low-power, continuous-wave lasing for compact photonic applications

Apr. 12, 2026 at 5:51am

Got story updates? Submit your updates here. ›

A highly structured abstract painting in soft colors featuring sweeping geometric arcs, concentric circles, and precise botanical spirals, conceptually representing the complex energy dynamics and structural order of a new type of quantum dot nanocrystal.A groundbreaking quantum dot design unlocks the potential for compact, energy-efficient laser technology with diverse photonic applications.Los Alamos Today

Researchers at Los Alamos National Laboratory have achieved a major breakthrough in creating practical, energy-efficient quantum dot lasers. They have successfully demonstrated low-threshold, continuous-wave lasing using a new type of solution-processed colloidal quantum dot, opening the door to transformative photonic applications like on-chip optical systems.

Why it matters

Quantum dot lasers have long held promise as compact, efficient light sources, but achieving stable continuous-wave lasing has been a major challenge. This breakthrough overcomes previous limitations, paving the way for quantum dot lasers to be integrated into a wide range of photonic technologies from communications to medical devices.

The details

The Los Alamos team designed a new type of quantum dot called a type-(I+II) quantum dot heterostructure, which combines the properties of both spatially direct and indirect nanostructures within a single nanocrystal. This unique hybrid structure allows one exciton to radiate light efficiently while another remains spatially separated, stabilizing the multicarrier state and extending optical gain. As a result, the quantum dot lasers demonstrated significantly lower power requirements for continuous-wave operation compared to previous designs.

  • The research findings were published in the journal Nature Photonics on April 12, 2026.

The players

Victor Klimov

The principal investigator on the project and a scientist at Los Alamos National Laboratory.

Donghyo Hahm

The lead author of the study and a researcher at Los Alamos National Laboratory.

Valerio Pinchetti

A Director's Postdoctoral Fellow and spectroscopy expert at Los Alamos National Laboratory.

Los Alamos National Laboratory

A U.S. Department of Energy research laboratory located in Los Alamos, New Mexico, that has played a key role in the development of quantum dot laser technology.

Got photos? Submit your photos here. ›

What they’re saying

“This work is a significant technical milestone. We can now realistically imagine quantum dot lasers that operate continuously, efficiently, and across a broad spectrum of colors, opening doors to transformative photonic applications.”

— Victor Klimov, Principal Investigator

“This is the first time a solution-processed colloidal system has reached such a low threshold under continuous excitation while maintaining stable lasing performance.”

— Donghyo Hahm, Lead Author

“By making solution-processed quantum dots lasing-ready under low-power conditions, we are bridging the gap between lab demonstrations and scalable photonic technologies.”

— Valerio Pinchetti, Director's Postdoctoral Fellow

What’s next

The researchers plan to further optimize the quantum dot design and explore integrating the technology into various photonic device architectures, including on-chip optical interconnects and sensing platforms.

The takeaway

This breakthrough in quantum dot laser technology represents a significant step towards realizing the potential of compact, energy-efficient light sources for a wide range of photonic applications, from communications to medical devices. The focus on achieving stable continuous-wave lasing at low power levels is a crucial advancement that could accelerate the adoption of quantum dot-based photonics.